| \ High level floating point 14jan94py |
\ High level floating point 14jan94py |
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| : faligned ( addr -- f-addr ) |
\ Copyright (C) 1995 Free Software Foundation, Inc. |
| [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ; |
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| : falign ( -- ) |
\ This file is part of Gforth. |
| here dup aligned swap |
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| ?DO bl c, LOOP ; |
\ Gforth is free software; you can redistribute it and/or |
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\ modify it under the terms of the GNU General Public License |
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\ as published by the Free Software Foundation; either version 2 |
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\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
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\ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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\ GNU General Public License for more details. |
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\ You should have received a copy of the GNU General Public License |
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\ along with this program; if not, write to the Free Software |
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\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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\ 1 cells 4 = [IF] |
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\ ' cells Alias sfloats |
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\ ' cell+ Alias sfloat+ |
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\ ' align Alias sfalign |
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\ ' aligned Alias sfaligned |
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\ [ELSE] |
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\ : sfloats 2* 2* ; |
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\ : sfloat+ 4 + ; |
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\ : sfaligned ( addr -- addr' ) 3 + -4 and ; |
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\ : sfalign ( -- ) here dup sfaligned swap ?DO bl c, LOOP ; |
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\ [THEN] |
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\ 1 floats 8 = [IF] |
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\ ' floats Alias dfloats |
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\ ' float+ Alias dfloat+ |
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\ ' falign Alias dfalign |
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\ ' faligned Alias dfaligned |
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\ [ELSE] |
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\ : dfloats 2* 2* 2* ; |
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\ : dfloat+ 8 + ; |
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\ : dfaligned ( addr -- addr' ) 7 + -8 and ; |
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\ : dfalign ( -- ) here dup dfaligned swap ?DO bl c, LOOP ; |
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\ [THEN] |
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: sfalign ( -- ) \ float-ext s-f-align |
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here dup sfaligned swap ?DO bl c, LOOP ; |
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: dfalign ( -- ) \ float-ext d-f-align |
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here dup dfaligned swap ?DO bl c, LOOP ; |
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1 sfloats constant sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus |
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dofield: lastxt code-address! \ change the constant into a field |
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1 dfloats constant dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus |
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dofield: lastxt code-address! \ change the constant into a field |
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| : f, ( f -- ) here 1 floats allot f! ; |
: f, ( f -- ) here 1 floats allot f! ; |
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| \ !! have create produce faligned pfas |
: fconstant ( r -- ) \ float |
| : fconstant ( r -- ) |
Create f, |
| Create falign f, |
DOES> ( -- r ) |
| DOES> faligned f@ ; |
f@ ; |
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| : fvariable |
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| Create falign 0 f, |
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| DOES> faligned ; |
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| : fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ; |
: fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ; |
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| : FLit ( -- r ) r> faligned dup f@ float+ >r ; |
: FLit ( -- r ) r> dup f@ float+ >r ; |
| : FLiteral ( r -- ) postpone FLit falign f, ; immediate |
: FLiteral ( r -- ) |
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BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT |
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postpone FLit f, ; immediate |
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|
| &16 Value precision |
&15 Value precision |
| : set-precision to precision ; |
: set-precision to precision ; |
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| : scratch ( r -- addr len ) |
: scratch ( r -- addr len ) |
| : -zeros ( addr u -- addr' u' ) |
: -zeros ( addr u -- addr' u' ) |
| BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ; |
BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ; |
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| : f. ( r -- ) scratch represent 0= |
: f$ ( f -- n ) scratch represent 0= |
| IF 2drop scratch 3 min type EXIT THEN |
IF 2drop scratch 3 min type rdrop EXIT THEN |
| IF '- emit THEN dup >r 0<= |
IF '- emit THEN ; |
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: f. ( r -- ) f$ dup >r 0< |
| IF '0 emit |
IF '0 emit |
| ELSE scratch r@ min type r@ precision - zeros THEN |
ELSE scratch r@ min type r@ precision - zeros THEN |
| '. emit r@ negate zeros |
'. emit r@ negate zeros |
| \ I'm afraid this does not really implement ansi semantics wrt precision. |
\ I'm afraid this does not really implement ansi semantics wrt precision. |
| \ Shouldn't precision indicate the number of places shown after the point? |
\ Shouldn't precision indicate the number of places shown after the point? |
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| : fe. ( r -- ) scratch represent 0= |
: fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
| IF 2drop scratch 3 min type EXIT THEN |
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| IF '- emit THEN 1- s>d 3 fm/mod 3 * >r 1+ >r |
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| scratch r@ min type '. emit scratch r> /string type |
scratch r@ min type '. emit scratch r> /string type |
| 'E emit r> . ; |
'E emit r> . ; |
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| : fs. ( r -- ) scratch represent 0= |
: fs. ( r -- ) f$ 1- |
| IF 2drop scratch 3 min type EXIT THEN |
scratch over c@ emit '. emit 1 /string type |
| IF '- emit THEN 1- >r |
'E emit . ; |
| scratch 1 min type '. emit scratch 1 /string type |
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| 'E emit r> . ; |
require debugging.fs |
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| : fnumber ( string -- r / ) dup count >float 0= |
: sfnumber ( c-addr u -- r / ) |
| IF defers notfound ELSE drop THEN ; |
2dup [CHAR] e scan |
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dup 0= |
| ' fnumber IS notfound |
IF |
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2drop 2dup [CHAR] E scan |
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THEN |
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nip |
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IF |
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2dup >float |
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IF |
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2drop state @ |
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IF |
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POSTPONE FLiteral |
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THEN |
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EXIT |
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THEN |
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THEN |
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defers notfound ; |
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' sfnumber IS notfound |
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: fvariable ( -- ) |
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Create 0.0E0 f, ; |
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\ does> ( -- f-addr ) |
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1.0e0 fasin 2.0e0 f* fconstant pi |
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: f2* 2.0e0 f* ; |
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: f2/ 0.5e0 f* ; |
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: 1/f 1.0e0 fswap f/ ; |
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\ We now have primitives for these, so we need not define them |
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\ : falog ( f -- 10^f ) [ 10.0e0 fln ] FLiteral f* fexp ; |
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\ : fsinh fexpm1 fdup fdup 1.0e0 f+ f/ f+ f2/ ; |
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\ : fcosh fexp fdup 1/f f+ f2/ ; |
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\ : ftanh f2* fexpm1 fdup 2.0e0 f+ f/ ; |
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\ : fatanh fdup f0< >r fabs 1.0e0 fover f- f/ f2* flnp1 f2/ |
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\ r> IF fnegate THEN ; |
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\ : facosh fdup fdup f* 1.0e0 f- fsqrt f+ fln ; |
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\ : fasinh fdup fdup f* 1.0e0 f+ fsqrt f/ fatanh ; |
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\ !! factor out parts |
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: f~ ( f1 f2 f3 -- flag ) \ float-ext |
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fdup f0= |
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IF |
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fdrop f= EXIT |
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THEN |
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fdup f0> |
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IF |
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frot frot f- fabs fswap |
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ELSE |
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fnegate frot frot fover fabs fover fabs f+ frot frot |
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f- fabs frot frot f* |
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THEN |
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f< ; |
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| 1e0 fasin 2e0 f* fconstant pi |
: f.s ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 |
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?DO dup i - 1- floats fp@ + f@ f. LOOP drop ; |